Bosch Professional Multi-Material Wall Detector - 120 mm Max Detection Depth (GMS 120-27)

High-Confidence Substructure Scanning and Shock-Absorbing Jobsite Protection

 

The Bosch Professional GMS 120-27 Wall Scanner is a highly intuitive, industrial-grade detection solution engineered to deliver ultimate drilling confidence by locating hidden obstructions behind walls with great speed. Driven by an advanced multi-mode sensory array, this heavy-duty detector strips away structural guesswork, locating magnetic and non-magnetic metals, live electrical cabling, and wooden substructures tucked inside drywall or concrete. To ensure seamless operation on punishing jobsites, its rugged architecture features a shock-absorbing rubberized casing paired with comprehensive IP54 dust and splash water protection. With a straightforward user interface that centers results directly around a color-coded physical marking hole, the GMS 120-27 provides tradespeople with the safety and speed required when mounting heavy site fixtures.

 

Key Features

• Deep Multi-Material Detection: Effortlessly scans and identifies hidden objects down to an absolute maximum depth of 120 mm for non-magnetic metals and 100 mm for magnetic ferrous metals.

• Live Cable Safeguarding: Pins down the exact pathway of live electrical wiring down to a depth of 50 mm to prevent hazardous drilling accidents.

• Drywall Wood Stud Tracking: Locates underlying wooden support battening and drywall framing up to a depth of 30 mm for reliable anchor placements.

• Color-Coded Target Marking Hole: Displays clear visual signal results on screen alongside a central, illuminated target hole to let users mark drilling spots instantly.

• Rugged IP54 Jobsite Construction: Built with an impact-resistant, rubberized outer shell engineered to shrug off drops, coarse dust, and water splashes.

• Advanced Material Identification: Intelligently identifies and displays structural characteristics, letting the user know if a target is a magnetic metal, non-magnetic copper pipe, or live wire.

• Flexible Dual-Power Source Arc: Can be powered via standard AA alkaline batteries or upgraded using the Bosch BA 3.7V Lithium-Ion rechargeable battery pack.

 

Technical Specifications

• Maximum Detection Depth: 120 mm
• Detection Depth, Magnetic Metal (Max): 100 mm
• Detection Depth, Non-Magnetic Metal (Max): 120 mm
• Detection Depth, Live Cables (Max): 50 mm
• Detection Depth, Wooden Substructures (Max): 30 mm
• Dust and Splash Protection Rating: IP54

• Material Identification Types: Live Object, Magnetic Metal, Non-Magnetic Metal, Non-Metal

• Power Supply Options: 2 x 1.5 V LR6 (AA) / 2 x 1.2 V HR6 (AA) / 1 x BA 3.7V Li-Ion Pack

• Automatic Switch-Off Limit: 5 minutes

• Weight (Approx.): 0.29 kg

 

Ideal For

• Kitchen Installers & Shopfitters: Scanning drywall and tiled partitions before mounting heavy wall cabinets, countertops, brackets, or extractor fans.

• Plumbers & HVAC Technicians: Locating embedded copper plumbing pipes, rebar grids, and steel conduits before coring walls for drainage lines or split A/C brackets.

• Electricians & M&E Contractors: Tracking down live electrical wire trunks and tracing safe chasing pathways across renovated building spaces.

• General Drywalling & Partitioning: Finding hidden timber studs and steel tracks beneath gypsum boards to ensure strong, structural screw anchorage.

 

What’s in the Box? (0601081700)

• 1 x Bosch Professional GMS 120-27 Multi-Material Wall Detector

• 2 x 1.5 V LR6 Alkaline Batteries (AA)

• 1 x Protective Fabric Storage Pouch

• 1 x Hand Carrying Wrist Strap

• 1 x User Operation and Safety Manual

• Supplied in a Protective Retail Cardboard Box

 

Frequently Asked Questions (FAQ)

1. How does the GMS 120-27 compare to older Bosch detector models? The GMS 120-27 introduces a heavily upgraded, modern user interface with simpler mode selections and vastly superior visibility. It also adds a thick, shock-absorbing rubber outer armor casing and a formal IP54 resilience rating, making it much better suited for tough, dusty jobsite drops than older generations.

2. Can I mark the exact spot to drill directly through the tool? Yes. The tool features a physical, open center marking hole located directly above the display screen and right at the center of the sensor ring. When the display illuminates its visual targeting crosshairs or change status to indicate a precise hit, you can slide a pencil or fine-tipped marker directly through the center hole to mark your pinpoint drilling coordinate onto the wall surface.

3. Does this device require calibration before its first out-of-the-box use? No, the GMS 120-27 is fully auto-calibrating out of the box. Every time the scanner is powered on, it runs an immediate background evaluation loop to adjust for standard environmental conditions, allowing you to start scanning straight away.

4. How should I clean the scanner to keep the sensors responsive? Wipe the plastic face and the bottom synthetic glides using a soft, dry cloth. Never use harsh solvents or chemical liquids. Since the sensor area on the back relies on consistent contact signatures, avoid sticking adhesive labels or metal foil badges near the scan pad.